.A SYSTEM dF ' 
of the fame bulk or volume as the ebaf 
was. 
From England, and among the aluni 
rock at Moltorp and Billingen in the pro- 
vinee of Weftergottland. 
SECT. CLX. 
^ 3. With abundance of argillaceous earth,* 
Stone coal. It burns with a flame by it-' 
felf, otherwife it looks like other flates. 
It is found at Gullerafen, in the parifli 
of Rettwik, in the province of Da- 
lame, and alfo with the coals at Boferup 
in Skone ^9 
SECT. CLXL 
6, Mineral phiogifton mixed with metallic 
earths, Phlo.gifion miner ale metallis impreg- 
natum. 
This is not found in any great quantity : 
in regard to its external appearance, it re- 
fembies pit-coal ; and the fat fubftance con- 
tained in it, at times partly burns to coal, and 
partly volatilizes in a calcining heat. 
The only known varieties of this kind are,* 
A, Minera cupri phlogiftica. 
When it has been inflamed, it retains the 
fire, and at laft burns to afhes, out of which 
* 7 his lafi: mentioned kind has induced me to believe, that 
the earth of the pic- coals is an argillaceous one, but is not fo 
eafy to be difcovered after its being burnt. The pit-coals 
contain more or lefs of the vitriolic acid, for which reafon tha 
fmoak arifmg from them attacks filver in the fame manner asf 
fulphur does ; though the coals be ever fo free from marca- 
fite, which hov/ever is often found imbedded or mixed with' 
them, 
pur©’ 
